If you have 6000 lb axles, it makes sense to get 3000 lb tires, which are E rated, 16 inch LT tires. 80PSI Lots of choices.

If you want more capacity at 16", you need more PSI in the tires. Goodyear makes the most proven 16inch tires at higher PSI. Like 110 psi. You will need to also buy a portable compressor for this (200 bucks or so)...for those situations where the gas station pumps don't go that high.

Should I get the popcorn out yet? this is a highly sensitive topic...ha ha.

If you want more capacity at 16", you need more PSI in the tires. Goodyear makes the most proven 16inch tires at higher PSI. Like 110 psi. You will need to also buy a portable compressor for this (200 bucks or so)...for those situations where the gas station pumps don't go that high.

Should I get the popcorn out yet? this is a highly sensitive topic...ha ha.

Just to throw more heat on this post, I went from 235/80 16's like you and replaced them with with LT265/75E 16's and love them. No contact latterally, horizontally or vertically. But that is on my Jayco TH and of course every model and brand will have less or more clearances that I do.

NOW Here's a Tire!! Michelin 235 75R 17.5J. We got these two years ago and they still look brand new. We have 8K axles with MorRyde IS Suspension and Disc breaks -- it is a great combination. The diameter is 31.3 and the old goodyears were 30.8. Not that much of a jump-- we have plenty of room. The load rating is 6005 lbs.

We had a serious blowout with the goodyears -- and I said that's it. So we got the michelins -- which are actually commercial grade trailer tires.

Atom Ant wrote:Look at your GAWR on the side sticker. Your going to see 6,000 lbs or under with a GVWR of only 14,000 lbs. (6K per axle + 2K pin = 14K) Montana didn't go to 7K axles until 2007. Pick any US made Load Range E LT tire you want in that size. They will all be 3,042 lb capacity at 80 psi or close. Michelin XPS ribs are popular and pricey. Firestone Transforce also are a hit.

G614s would be overkill. If you weigh in with more than 12K on those axles, you are already overloading the axles.

X2

R250 will work fine up to 3k lbs per tire OP. If you go with the G614 you'll need to check to see if your wheels can handle 110 PSI. At any rate those Goodyears will be overkill on your Montana.
Of course knowing your weights and not guessing is part of the equation here.
Dexter recommends no less than one inch between tires.
Photo is Bridgestone Duravis R250 showing the distance between tires at over one and a half inches.

bcircus wrote:I have 2006 Montana 3295 fifth wheel and dry weight is 10800 with 3200 additonal capacity. So, I'm figuring around almost 13000 to 14000. Never carry more than a few gallons of water.
Maybe I'm confused. Looks like I'm going to need something around 3700 lb rating. I thought the duravis had a G and was rated around there. I had mixed feelings about the Goodyear G14? I know I don't really want ST tires. NEVER had good luck with them. That's why I wanted to go with an LT tire. I'm open to suggestions now, I guess. Confused... Convince me!
Not changing wheel or axle sizes. Need something in 16 inch.
bcircus

I have had two sets of GY G tires one set on our 32.5' Avion Platinum and the set that came on our current Mobile suites. 5 years on both sets. Neither set had any trouble not even a flat.

The GY G would be a great tire for your RV, at your weight you would probably only need to run 85-90 # based on actual tire weight using the inflation charts. Personally I did not worry about the 80# steel wheels on the Avion and ran 85psi.

Best part is if you have a tire problem GY is the only Mfg. that will pay for repairs.

Atom Ant wrote:The GVWR is the sum of your total axle weight and pin weight. They get to credit your truck for carrying some of the load, typically 20%. If you had 7K axles, your cargo capacity would be 5,600 lbs. instead of 3,600 lbs. Nothing real scientific about it.

I run the G614 too because I have 7K axles - new rig will have 8K. When I have to replace those G614s that still have good tread at $370 each because the are pushing 6 years, I could only wish I had the options you have to go to a standard truck tire and shop the market.

Contact Scott at trailertiresandwheels.com he will save you a bunch on tires. Ship to you and have someone mount them.

Atom Ant wrote:The GVWR is the sum of your total axle weight and pin weight. They get to credit your truck for carrying some of the load, typically 20%. If you had 7K axles, your cargo capacity would be 5,600 lbs. instead of 3,600 lbs. Nothing real scientific about it.

I run the G614 too because I have 7K axles - new rig will have 8K. When I have to replace those G614s that still have good tread at $370 each because the are pushing 6 years, I could only wish I had the options you have to go to a standard truck tire and shop the market.

Contact Scott at trailertiresandwheels.com he will save you a bunch on tires. Ship to you and have someone mount them.